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Significant Customers & Concentration of Credit Risk (Details Textual) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Concentration Risk [Line Items]      
Unbilled accounts receivable 86,564us-gaap_AccountsReceivableNetCurrent   $ 99,638us-gaap_AccountsReceivableNetCurrent
Single Customer [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= gpx_SingleCustomerMember		 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= gpx_SingleCustomerMember		  
Single Financial Services Customer [Member]      
Concentration Risk [Line Items]      
Unbilled accounts receivable 25,800us-gaap_AccountsReceivableNetCurrent
/ us-gaap_MajorCustomersAxis
= gpx_SingleFinancialServicesCustomerMember		    
Revenue [Member] | Single Financial Services Customer [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_MajorCustomersAxis
= gpx_SingleFinancialServicesCustomerMember		    
Revenue [Member] | Automotive Industry [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= gpx_AutomotiveIndustryMember		 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= gpx_AutomotiveIndustryMember		  
Revenue [Member] | Financial & Insurance Industry [Member] [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 24.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= gpx_FinancialInsuranceIndustryMember		 14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= gpx_FinancialInsuranceIndustryMember		  
Revenue [Member] | United States Government [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 8.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= gpx_UnitedStatesGovernmentMember		 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= gpx_UnitedStatesGovernmentMember		  
Accounts Receivable [Member] | Single Financial Services Customer [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 21.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_MajorCustomersAxis
= gpx_SingleFinancialServicesCustomerMember